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1. MS11 Split inverter course
Daikin Europe NV
2
Equipment selection
What is in this chapter?
Introduction
Selecting the right unit for the right application can prevent a lot of problems.
In this chapter we would like to introduce you to information which will help
you select the correct unit. However, even with the right unit, there will still
be some points of attention, which will have to be taken into account.
Overview
This chapter covers the following topics
Topic
See Page
2.1 Selection specifications
2.2 Combination possibilities
2.3 Installation specifications
2.4 Application precautions
CHAPTER 2: Equipment selection
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Daikin Europe NV
2.1 Selection specifications
Overview
This chapter covers the following topics
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
Topic
Non inverters
Inverters
Correction factors
Capacity tables
Attention points in selection
CHAPTER 2: Equipment selection
See Page
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Daikin Europe NV
2.1.1 Non inverters
Introduction
You should select a unit by comparing the (maximum possible) heat load of a
room to the nominal capacity of a unit.
If your heat load is much larger than your nominal capacity, you will have
capacity shortage complaints.
If your heat load is much smaller than the nominal capacity, your unit will
switch on/off a lot, which has a negative effect on the lifetime of a unit.
Capacity table
Global Mini Split
Unit
FT(Y)N50EV1B
FT(Y)N60EV1B
Mode
Cooling
Heating
Cooling
Heating
CHAPTER 2: Equipment selection
Nominal Capacity [kW]
5.0
5.8
6.0
7.0
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2.1.2 Inverters (DC inverter)
Introduction
When selecting an inverter controlled A/C unit, it is of the up most
importance to select a unit with a nominal capacity as close as possible to the
heat load of the room. When selecting a unit, which is too small, the
compressor will operate continuously on its maximum frequency like a non
inverter. If you select a unit that has too much capacity, the minimum
frequency of the compressor can still generate too much capacity and switch
the compressor on/off like a non inverter. You can see that in both these
cases an inverter has no added value compared to a non inverter which is a lot
cheaper.
Minimum
capacity
When the unit is in thermostat ON, there is a minimum compressor frequency
and a minimum expansion valve opening. If the required capacity is below
the minimum capacity of the compressor, the unit will switch ON-OFF.
Maximum
capacity
When a unit runs at its maximum frequency and the expansion valve is
opened to the maximum the unit will give its maximum capacity. (For the
mentioned indoor/outdoor and accordingly to the installation conditions.)
However it is very important that you realize that this will not always be
the case, even when the capacity demand is high. The unit is controlled by
a micro-controller and the micro-controller will take all factors into account
(capacity demand, safeties, efficiency, sensors, etc. …) and then decide the
best frequency. If you combine this together with piping length losses, it is
very likely that when you select a unit on the maximum capacity you will
have complaints of capacity shortage.
Continued on the next page
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Daikin Europe NV
2.1.3 Correction factors
Correction factors
When the piping exceeds a certain length, a correction factor has to be
multiplied with the rated capacity.
The cooling and the heating capacity of the unit have to be corrected in
accordance with the length of the refrigerant piping. (The distance between
the indoor unit and the outdoor unit)
Fig.:
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Daikin Europe NV
2.1.4 Capacity tables
Introduction
For the Multi outdoor units, when your connection ratio goes above 100%,
the minimum, nominal and maximum capacities will lower (only when the
capacity demand of the indoor units is greater than the outdoor unit can
deliver). What your minimum, nominal and maximum capacity will be when
this happens, you can read out on the capacity tables. (Engineering Databook)
The maximum allowed connection ratios are
Modelname
2(A)MXS52EV1B
3MKS50E2V1B
3(A)MXS52E2V1B
4MKS58E2V1B
4MXS68E2V1B
4MKS75E2V1B
4MXS80E7V3B
5MKS90E7V3B
5MXS90E7V3B
Max. connectable
capacity (kW)
8.5
9.5
9.0
10.0
11.0
13.5
14.5
15.6
15.6
For the C/O units, there’s an additional function programmed that will limit
the operation of units when you connect more than the allowed capacity.
When an indoor unit is switched on, over sizing the allowed operational
capacity of a C/O multi, the last unit which is turned ON will go into stand-by
mode (slowly blinking indoor operation LED). It will only resume operation
once operation in the other rooms (or one room) has stopped.
This function has been added to prevent the compressor from overheating
(overload clixon).
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Daikin Europe NV
2.1.5 Selection attention points
Introduction
When selecting a model there are some points of attention. You should
select your type of unit and installation place carefully.
Selection
according to
room type.
Living room
Bedroom
Selection
according to air
circulation for
different room
types.
Selection
according to air
circulation
distinctive to the
different air
conditioning
types.
Rectangular
rooms
Long rooms,
Odd shaped
rooms
Wall mounted
type
Floor type
Ceiling hung
type
this is often used from morning to night,
an energy saving unit would be
recommended
It is important to select an air conditioner,
which is quiet and does not blow (draft)
directly onto the occupants.
Install the unit so it blows into the length
of the room.
Install separate units to blow air through
the room.
Install separate units to prevent air
accumulation in one place.
This type of unit allows great air
circulation in cooling, this due to its high
position. This position is however a
disadvantage for heating, as heat rises,
stratification is possible.
This type of unit is more suitable for
heating applications than cooling
applications. Since hot air rises there are
few temperature differences between
heights.
This type of unit can be put in a central
position in the room, allowing a good air
circulation.
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Daikin Europe NV
2.2 Combination possibilities
Introduction
On the following page you will find our combination table. These pictograms
point out the possibilities as well as the limitations of the combinations. Also
a file which is named FAQ (Frequently Asked Questions) is added. This will
give you some more clarification why certain specific combinations are not
possible.
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Daikin Europe NV
2.3 Installation specifications
Introduction
This chapter gives a summary of the basic technical specifications concerning
piping which are essential to a decent installation. All this information can be
found back in the installation manual of the specific unit.
Overview
Topic
See Page
RYN50/60E2V1B
(A)RK/XS50/60/71E2V1B
(A)RXG25/35E(2)V1B
ARK/XS20/25/35E2V1B
2(A)MXS52E2V1B, 3(A)MK/XS50/52E2V1/MB,
4MKS58E2V1B
4MK/X58/68E2V1B
5MK/XS90E7V3B, 4MXS80E7V3B
Additional explanation on installation comments
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Daikin Europe NV
RYN50/60E2V1B
Pipe sizes
The table below shows the available piping connections.
Liquid line
Gas line
RYN50/60E2V1B
6.4 mm
12.7 mm
Table : piping dimensions
Piping lengths
The table below shows the maximum allowed piping lengths.
Total length
Level difference
RYN50/60E2V1B
30 m
20 m
Table: piping lengths
Additional
refrigerant
charge
For the RYN50/60E2V1B add 20 g/m when piping exceeds 10 m.
Fuses
Daikin recommends using a 20A safety breaker.
Continued on the next page
CHAPTER 2: Equipment selection
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Daikin Europe NV
RYN50/60E2V1B, continued
Installation
space
Fig.: Outdoor unit positioning
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Daikin Europe NV
(A)RK/XS50/60/71E2V1B
Pipe sizes
The tables below show the available piping connections
Liquid line (mm)
Gas line (mm)
(A)RK/XS50/60E2V1B RK/XS71E2V1B
6.4 mm
12.7 mm
15.9 mm
Table : Piping dimensions
Piping lengths
The table below shows the maximum allowed piping lengths.
Total length
Level difference
(A)RK/XS20/25/35DVMB
30 m
20 m
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses
Daikin recommends using a 20 A safety breaker.
Continued on the next page
CHAPTER 2: Equipment selection
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Daikin Europe NV
(A)RK/XS50/60/71E2V1B, continued
Installation
space
Fig.: Outdoor unit positioning
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Daikin Europe NV
(A)RXG25/35E(2)V1B
Pipe sizes
The tables below show the available piping connections
Liquid line (mm)
Gas line (mm)
Piping lengths
(A)RXG25/35E(2)V1B
6.4 mm
9.5 mm
The table below shows the maximum allowed piping lengths.
Total length
Level difference
(A)RXG25/35E(2)V1B
20 m
15
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses
Daikin recommends using a 16 A safety breaker.
Continued on next page
CHAPTER 2: Equipment selection
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Daikin Europe NV
(A)RXG25/35E(2)V1B, Continued
Installation
space
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Daikin Europe NV
ARK/XS20/25/35E2V1B
Pipe sizes
The tables below show the available piping connections
Liquid line (mm)
Gas line (mm)
Piping lengths
ARK/XS20/25/35E2V1B
6.4 mm
9.5 mm
The table below shows the maximum allowed piping lengths.
Total length
Level difference
(A)RXG25/35E(2)V1B
20 m
15
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when piping length exceeds 10 m.
Fuses
Daikin recommends using a 16 A safety breaker.
Continued on next page
CHAPTER 2: Equipment selection
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Daikin Europe NV
ARK/XS20/25/35E2V1B, Continued
Installation
space
CHAPTER 2: Equipment selection
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Daikin Europe NV
2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B,
4MKS58E2V1B.
Pipe sizes
The tables below show the available piping connections
2(A)MXS52E2V1B/3MXS52E2V1B/3(A)MK
S50E2V1B/4MKS58E2V1B
Liquid line
Gas line
6.4 – 9.5 – 12.7 – 15.9
Table : Piping dimensions
Piping lengths
The table below shows the maximum allowed piping lengths.
2(A)MXS52E2V1B/3MXS52E2V1B/3(A)
MKS50E2V1B/4MKS58E2V1B
Piping to each indoor
25 m
Total piping
50 m
Min piping length to each indoor
3m
Max. level difference between 2
7.5 m
indoors if the outdoor is
positioned higher than all the
indoors
Max. level difference between 2
15 m
indoor units if the outdoor is
lower than 1 or more indoors
Max level difference between
7.5 m
indoor/outdoor if the outdoor is
lower than 1 or more indoors
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when total piping length exceeds 30 m.
Fuses
Daikin recommends using a ? A safety breaker. (2MK/XS40DVMB)
Continued on the next page
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Daikin Europe NV
2(A)MXS52E2V1B, 3MXS52E2V1B, 3(A)MKS50E2V1B,
4MKS58E2V1B., continued
Installation
space
Fig.: Outdoor unit positioning
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4MXS68E2V1B, 4MKS58E2V1B,
Pipe sizes
The tables below show the available piping connections.
Liquid line(mm)
Gas line (mm)
4MKS58D
6.4 / 6.4 / 6.4 / 6.4
9.5 / 9.5 / 12.7 / 12.7
4MXS68D
6.4 / 6.4 / 6.4 / 6.4
9.5 / 9.5 / 12.7 / 12.7
Table : Piping dimensions
Piping lengths
The table below shows the maximum allowed piping lengths.
4MKS58D
Max. piping to each indoor
Max. level difference between 2
indoors if the outdoor is positioned
higher than all the indoors
Max. level difference between 2 indoor
units if the outdoor is lower than 1 or
more indoors
Max
level
difference
between
indoor/outdoor if the outdoor is lower
than 1 or more indoors
Total length of piping
4MXS68D
25
7.5
15 m
7.5 m
60
Table: Piping lengths
Additional
refrigerant
charge
Add 20 g/m when total piping length exceeds 30 m.
Cooling only units are chargeless! There is no need for additional refrigerant!
Fuses
Daikin recommends using a ?? A safety breaker.
Continued on next page
CHAPTER 2: Equipment selection
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Daikin Europe NV
4MXS68E2V1B, 4MKS58E2V1B,, Continued
Installation
space
Fig.: Outdoor unit positioning
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5MKS90E7V3B, 5MXS90E7V3B, 4MXS80 E7V3B,
Pipe sizes
The tables below show the available piping connections
Liquid line (mm)
Gas line (mm)
5MKS90E7V3B, 5MXS90E7V3B,
4MXS80 E7V3B
6.4
9.5 / 9.5 / 12.7 / 15.9 (/ 15.9)
Table : Piping dimensions
Piping lengths
The table below shows the maximum allowed piping lengths.
4MXS80 E7V3B
Max. piping to each indoor
Max. level difference between 2
indoors if the outdoor is positioned
higher than all the indoors
Max. level difference between 2
indoor units if the outdoor is lower
than 1 or more indoors
Max level difference between
indoor/outdoor if the outdoor is lower
than 1 or more indoors
Total length of piping
Min piping length to one indoor unit
25 m
7.5 m
5MKS90E7V3B,
5MXS90E7V3B
25 m
7.5 m
15 m
15 m
7.5 m
7.5 m
70 m
3m
75 m
3m
Table: Piping lengths
Additional
comments
•
•
Always connect a minimum of 2 rooms for heat pump systems.
The shortest allowable length per room is 3 m.
Additional
refrigerant
charge
•
•
Add 20 g/m when total piping length exceeds 30 m.
For cooling only models, there’s no need to additionally charge. ???(see
installation manual)
Continued on the next page
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4MKS90DVMB, 4MXS80DVMB, continued
Fuse
Daikin recommends a 20 A fuse
Installation
space
Fig.: Outdoor unit positioning
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Additional comments on installation specifications
Installation
Manual
Additional refrigerant is necessary when the piping exceeds a certain
length. For the multi units however you don’t need to add any
refrigerant for C/O units.
Explanation
The evaporator regulates the superheat (SH), the larger your evaporating
capability (fan speed, size heat exchanger, heat exchanging capability) the
larger your SH will be.
The condenser regulates your subcool (SC), which is needed for the
expansion valve to work properly.
In cooling the evaporator is the indoor coil and the condenser the outdoor
coil. This changes when the unit is in heating, so the sizes of the H/E can
change.
In heating on small loads the unit will have a small SC (low condensing
capability). When refrigerant is added the SC goes up. Adding refrigerant
also means that the SH will go down but in heating there’s a large evaporator
which can handle this surplus of refrigerant.
Installation
Manual
Always connect at least 2 rooms to a Multi.
Explanation
(Strictly speaking, for heat pump models only.)
If you connect only 1 indoor unit you will have compressor damage due to the
following reasons:
1. Abnormal high pressure
Surplus refrigerant is accumulated in the indoor unit during heating operation,
at that point, the heat exchanger thermistor is in sub cooling area and it can
not sense the saturated temperature. Therefore the safety (peak cut operation)
can not function leaving the unit prone to high pressures.
However, surplus refrigerant is accumulated in the non operating unit whilst
one unit is operating in a two unit connection in heating mode.
2. Poor lubrication by refrigerant oil
When you connect only 1 indoor unit to a multi, surplus refrigerant is
accumulated in the indoor unit or accumulator. In case the refrigerant is
accumulated in the accumulator, you’ll have wet operation and poor
lubrication and this will lead to compressor damage.
Continued on the next page
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